Feeling
cold is a symptom that can signify different causes. In many cases, this sign is
experienced by people with other health problems, such as fatigue and low energy levels.

As about those who suffer from a constant chill (a sensation of coldness,
which is often accompanied by shivering and pallor of the skin), there are two
primary causes: low metabolism and reduced blood flow to body organs and tissues.

Blood flow in the human body is mainly controlled by a single factor: the automatic respiratory pattern. Clinical evidence suggests that over 90% of the modern population have too fast and too deep automatic breathing.

Cold body sensation all the time in the severely sick

Always feeling cold is common during last stages of cancer and HIV-AIDS
(usually together with cachexia and ordinary night sweating). These people
commonly have less than 10 seconds for the body oxygen test. Clinical studies suggest that these groups of people have up to 30-50 breaths per minute for their respiratory frequency at rest (see cancer and HIV-AIDS pages), while the norm is only 10-12 small diaphragmatic breaths per minute.

The solution is to slow down own breathing. This will improve circulation and oxygen supply.

Feeling cold all the time may indicate thyroid or liver problems (with reduced
hunger and some weight loss). However, these conditions also relate to low body
oxygenation.

Feeling cold all the time (with weight loss, but normal eating) can indicate
the presence of GI parasites, such as roundworms or flatworms.

Cold body sensation after eating

Feeling
cold after eating can indicate too slow absorption of nutrients
in the gut or low GI (glycemic index) of consumed foods. Generally,
two key factors that contribute to this effect:
poor circulation (with low body O2) and low glycemic
index of foods. For example, if a person with
about 20 s for body O2 starts their meal with a salad or barley (GI 20%), then
his or her blood sugar increase will be too slow, while digestive organs may require more
energy for peristalsis. Then this person may get even a headache in addition to
feeling cold. Such people (with poor blood sugar control) often suffer from
reactive hyperglycemia and reactive hypoglycemia. They commonly experience
feeling hot and cold (hot after meals and cold when too blood insulin is too
high and too much blood glucose driven into fat cells).

Always feeling cold, but only during winter time

Some people get this unpleasant sensation of chilliness only when it is cold outdoors or during winter time. Such symptom can occur even when they have up to 30-40 s for the DIY body oxygen test, as for my advanced students. The solution to this problem is ... (it is hidden as bonus content)

Feeling cold in the chest, head, stomach, leg or throat is a rarer
symptom. There are about ten times fewer people for symptoms in each of these
body organs than those people who get whole body chills. Feeling cold in
specific organs also disappears with increased body oxygenation and more
physical exercise.

Feel cold during pregnancy or due to an inactive lifestyle

Finally, some females feel cold during pregnancy (notably, the first
trimester), people after surgery, and those who improved their digestive health
with partial recovery from ulcers and IBD (ulcerative colitis and Crohn's disease). This is an extract from my best selling Amazon book about digestion:

"As it was previously discussed, some people with digestive problems are not
able to safely run due to ulcers and other abnormalities in their digestive
organs. As a result, to restore their health, they often focus on
gentle types of exercise, such as cycling, using exercise bikes and safe types
of weightlifting.

When these people partially recovered their GI health and can safely start
running, they can experience chill, a sensation of coldness, which is often
accompanied by shivering and pallor of the skin.

This chill is a sign that the body is ready and even requires running to normalize metabolism, digestive health, circulation and other vital functions after a long time of physical “semi-hibernation”. Therefore, if you get this sensation, start running (on a soft surface) and later gradually increase duration and intensity."

In other words, running with nose breathing is the proven solution for
problems related to feeling
cold during pregnancy, after surgeries, and for people who do not go jogging
with strictly nasal breathing. Note that many people feel cold after exercise,
such as cycling and weightlifting, but not after running.

Note. For those people who have only cold extremities (not the whole
body symptom of feeling cold), they can find answers on the pages devoted to
Causes of cold hands and feet
and Cold feet.

How to stop always feeling cold, even at night

Various methods and techniques immediately lead to the nearly double
reduction in intensity and severity of feeling cold all the time, even during
night sleep. You can stop feeling cold using the following techniques:
- Running with nose breathing (in and out) and perspiration
- Grounding your body for normalization of its electrical properties (Earthing)
- Prevention of mouth breathing (during sleep too)
- Prevention of supine sleep
- Simple reduced breathing exercise to reduce the sensation of feeling cold (the same
exercise is used to warm up cold hands and feet).

However, to get rid of feeling cold completely, one needs to get over 30
seconds for the morning body-oxygen-test results.